Journal of Research of the National Bureau of Standards
AbstractIsopiestic vapor pressure measurements have been made on the ternary system water-sodium chloride-barium chloride at 25 �C. From these data the activity coefficient of each salt in the presence of the other has been calculated. The rule that the logarithm of the activity coefficient of one salt (which is equivalent to its chemical potential) varies linearly with the concentration of the other salt has been investigated. It is shown that this rule is at least approximately valid with the condition usually assumed, namely, that the total ionic strength is kept constant. It is shown, moreover, to be valid for another condition, namely, that the total concentration of ions is kept constant. This latter condition is more suited to isopiestic studies. Finally, the calculation of mutual solubilities from isopiestic data is described.
CiteJ. Res. Nat. Bur. Stand. Sec. A: Phys. Ch., Vol. 69A, No. 1, p. 19
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